An Improved Harmonic Power Sharing Scheme of Paralleled Inverter System

Due to the growing demand of the electric power and rapid penetration of power electronics equipment, the parallel inverter system which is connected with the nonlinear loads widely exists in islanded micro-grid. The effective harmonic power sharing scheme should be designed to guarantee the system stable operation. In this paper, a negative virtual impedance is introduced to improve the harmonic power sharing precision. The negative virtual impedance is chosen by an improved droop method based on the relationship between virtual inductance and harmonic reactive power. Besides, the voltage drop at PCC can be counteracted. The experimental results validate the correctness and feasibility of the proposed scheme.

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